1. Sakonna
2. Kassidy
3. Nerys
4. Grilka (yeah I'm down for the rough stuff)
5. Allura/Mardah/Leeta (tie)
6. Helen Noel (I know, wrong show but any excuse to post a picture of Marianna Hill is welcome.)
I know someone mentioned Female Changeling before. She was older when DS9 was in production, but Salome Jens in her younger day was one fine example of sexiness.

Young Salome Jens is also in original Outer Limits' "Corpus Earthling", with Robert Culp and Barry Atwater. With the voices of Vic Perrin and Robert Johnson ("This tape will self destruct in five seconds.")

You all have taken all the good ones...I'll just throw this out here and admit that if I were Sisko, I just would have traded a make-out session for the Jem'Hadar ship....though I'll bet she would be really bad at that, being a Vorta.

Of all the guest characters, I thought Gilora Rejal, the Cardassian scientist who thought O'Brien was coming on to her, was the prettiest. In fact, most of the Cardassian women on the show were quite lovely.

Of course, I'm not a guy. Male viewers probably have a different opinion about what factors make a woman beautiful. I tend to notice a person's eyes first, and their smile.

You all have taken all the good ones...I'll just throw this out here and admit that if I were Sisko, I just would have traded a make-out session for the Jem'Hadar ship....though I'll bet she would be really bad at that, being a Vorta.

When DS9 was in first run, I had such a crush on Jadzia/Farrell. These days though, I recognize how blind I was by not being a Nerys/Visitor guy. She's where it's at. ...

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It's almost the same with me. In the 90's as a teenager I loved Jadzia a lot (I even bought the life size cardboard of her) and I never had a special interest in Kira then. But since some years I'm feeling more attracted to Kira. Maybe it's because of my age. But these are only my feelings to the characters they played in DS9.
With a look to the actresses now, I'm staying with my old crush Terry Farrell.